I have made some comparison for you guys and hope EM designers will take their attention to this. Just a few examples.
Deus Ex game is more gloominess, dark and with tints of blue of neon ligts.
That's the authentic atmosphere of true Deus Ex. And I don't agreed with kind of glamour glittering backgrounds in art which we have here today.
Work with lighting carefully Devs, I beg you!

Grates

Sewers

Labs

Honestly, I don't see anything wrong with the original pictures. Also, the recolor only made them worse.

Pic 1. You managed to make it look like late evening. What's the point?
Pic 2. OK, I admit it. The recolored version looks a little better. But it may be only a concept art.
Pic 3. "Nurse, why's so dark in here? Turn on the lights."

One more thing. You subtitled your edits "Deus Ex". But DX1 doesn't look like that. There were dark areas and brights areas. Bleak and colorful. If you convince EM to make all of them dark, the game will be worse. To back is up...

Which version is better?

A piece of trivia. Your images are subject of a news article in pcgames.de. Unfortunately, the credit has been stolen by AaronJ. So Aaron... keep quoting posts with pictures. xD

Well I especially love the Shanguaï pictures they are really beautifull. Anyway bigger pictures helps to appreciate the details on them. But I'd have liked to see the one where you see the subway entrance.